Develop Reference

How to click WPF ScrollViewer down button

Following picture shows my project.
Here is XAML code for your testing needs.
<Window x:Class="MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="200" Width="525">
<ScrollViewer Name="ScrollViewer1" Height="67" VerticalAlignment="Top">
<StackPanel>
<TextBox Name="TextBox1" Text="TextBox1"/>
<TextBox Name="TextBox2" Text="TextBox2"/>
<TextBox Name="TextBox3" Text="TextBox3"/>
<TextBox Name="TextBox4" Text="TextBox4"/>
<TextBox Name="TextBox5" Text="TextBox5"/>
<TextBox Name="TextBox6" Text="TextBox6"/>
</StackPanel>
</ScrollViewer>
</Window>
Following picture shows my question;
So, how to click WPF ScrollViewer down button in order to go end of ScrollViwer?

A solution could be to subscribe to the click of that button like here https://stackoverflow.com/a/4932118/6890102, then call the ScrollToEnd() method of the ScrollViewer. But there might be a better solution.

Right-Click on ScrollViewer->Edit Template->Edit a Copy, to see the Scrollviewer's Template. The ScrollViewer contains a ScrollBar. A ScrollBar contains, RepeatButton, and a Track. The RepeatButton is responsible for the up and down movement of the scrollbar. Try checking it. You may find some idea on how to implement your objective.

Unable to edit TextBox in a UserControl WPF

I am working on a WPF application in which a user control is loaded over main window at run time.
I have a TextBox in the UserControl which is supposed to be a editable TextBox. But I am not able to edit it using keyboard input. Whereas, i am able to set the text pragmatically.
I have refered MSDN forum regarding the issue. Still i am not able to get through. My code is similar to one in the link above.
Please share your thoughts to get this done.
Thanks in advance.
Edit:
xaml code:
<UserControl x:Class="UserControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
Loaded="UserControl_Loaded"
FocusManager.IsFocusScope="True"
FocusManager.FocusedElement="{Binding ElementName=TestTxt}">
<Grid FocusManager.IsFocusScope="True">
<StackPanel Orientation="Horizontal" FocusManager.IsFocusScope="True">
<TextBox x:Name="TestTxt" IsReadOnly="False" IsEnabled="True" FocusManager.IsFocusScope="True"/>
</StackPanel>
</Grid>

In UserControl_Loaded add TestTxt.Focus();

Why DataBinding is not propagating to UserControl

This morning I asked a question here and doing a simple working sample gave me a different behavior than expected.
Full working sample at GitHub. Main partial code below.
In this present case, the command is never propagated to any UserControl, either if the UserControl is use directly as a child of the Window. It also not work if the UserControl is used as a DataTemplate for a ListBox ItemTemplate.
I also include a hack button to fix the problem where the Command reach the UserControls. The hack come from StackOverflow.
But using the hack does not explain why UserControl does not receive the Command (without it) and using this hack also break the first rule of good coding: "Hi cohesion and Low coupling". The hack should be used in the the window code in order for it to manage the Command in the UserControl, my thought is that it should happen by default.
Why the command is not propagating by default to the UserControl and what should I do to propagate the command to the UserControl in a clean way?
Note: Using only one CommandBinding (removing one or the other) in the UserControl does not fix the problem .
Partial code:
<Window x:Class="CommandRoutingIntoItemTemplate.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:CommandRoutingIntoItemTemplate"
xmlns:system="clr-namespace:System;assembly=mscorlib"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525">
<Grid>
<Grid.RowDefinitions>
<RowDefinition></RowDefinition>
<RowDefinition></RowDefinition>
<RowDefinition Height="Auto"></RowDefinition>
</Grid.RowDefinitions>
<local:UserControlTest></local:UserControlTest>
<ListBox Grid.Row="1">
<ListBox.ItemTemplate>
<DataTemplate>
<Border BorderBrush="Aqua" BorderThickness="2">
<local:UserControlTest></local:UserControlTest>
</Border>
</DataTemplate>
</ListBox.ItemTemplate>
<ListBox.Items>
<system:String>1</system:String>
<system:String>2</system:String>
</ListBox.Items>
</ListBox>
<StackPanel Grid.Row="2" Orientation="Horizontal">
<Button Command="local:Commands.CommandTest">Put focus on TestBlock and click here to see if command occurs</Button>
<Button Click="AddHack">Hack</Button>
</StackPanel>
</Grid>
</Window>
UserControl:
<UserControl x:Class="CommandRoutingIntoItemTemplate.UserControlTest"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:CommandRoutingIntoItemTemplate"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300">
<UserControl.CommandBindings>
<CommandBinding Command="local:Commands.CommandTest" CanExecute="CommandTestCanExecuteUserControl" Executed="CommandTestExecuteUserControl"></CommandBinding>
</UserControl.CommandBindings>
<Grid>
<TextBox Text="UserControlTest">
<TextBox.CommandBindings>
<CommandBinding Command="local:Commands.CommandTest" CanExecute="CommandTestCanExecuteTextBox" Executed="CommandTestExecuteTextBox"></CommandBinding>
</TextBox.CommandBindings>
</TextBox>
</Grid>
</UserControl>

The reason that you are not getting commands invoked on your user control is that your buttons are not in separate focus scope. For WPF to pick up focused element for command target correctly, it needs to be in separate focus scope from command invoking control.
Framework will just traverse up visual tree from button looking for command bindings in their focus scope (in your case it won't find any). When framework does not find any command bindings in current focus scope, only then it looks into parent focus scope for focused element (In your case, buttons are in Window focus scope which has no parent scope so the search will end there).
Simply setting FocusManager.IsFocusScope="True" on your StackPanel will fix the issue.
You could also specify CommandTarget property on your buttons to point to your user control and not rely on focus.

Cannot click or select Control XAML design

I develop on VS2010 WPF on Window 7. I have a project that does not throw any error or warning, compile fine, XAML design shows fine except I cannot click or select anyone controls in the XAML design view.
What is the reason, or how can I find out the problem or possible exception?

Had the same problem, I was able to select controls in the VS2012 WPF project previously but something had changed.
Worked out it was a TabItem in a TabControl, I had set the visibility to collapsed
<TabItem Visibility="Collapsed">
to hide the tab header at the top. Setting the TabItem visibility back to visible
<TabItem Visibility="Visible">
allows controls contained in the TabItem to be selected in the XAML design view.

I have reproduced this behavior by putting an empty grid as the last child element of my "main" Grid. In VS2010's designer, I cannot select any of the Buttons. Could this be your issue?
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid>
<Button Content="Button" Height="52" HorizontalAlignment="Left" Margin="93,74,0,0" Name="button1" VerticalAlignment="Top" Width="113" />
<Button Content="Button" Height="38" HorizontalAlignment="Left" Margin="280,100,0,0" Name="button2" VerticalAlignment="Top" Width="96" />
<Grid></Grid> <!-- THIS IS THE PROBLEM!!! -->
</Grid>
</Window>

Had this recently, building the project seemed to fix the problem.

Do you have a Pointer in your toolbox? Sometimes the Pointer item inside the toolbox is gone. So the next item (Border) is selected. So when you try to click, you are actually trying to add a border to the design. You might try resetting the toolbox. But be warned, custom tools are gone then, and have to be added again. (I could not make a comment to this question, so thats the reason I 'answered')

WPF menu closes on mouseup when window open from excel add-in project

I have a problem when creating a menu in WPF. What happens is that it closes automatically when you stop pressing the mouse button. I want it to behave as regular menu's where you can click and the subitems will stay up but I can't find anyway to get this done.
The code looks like this:
<Window x:Class="ExcelAddIn.MyWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300">
<Grid>
<DockPanel>
<Menu Width="Auto" IsMainMenu="True" >
<MenuItem Header="Item">
<MenuItem Header="SubItem" />
</MenuItem>
</Menu>
</DockPanel>
</Grid>
</Window>
I'm wondering if it has anything to do with logical focus maybe? I saw something about it might being a bug in .NET framwork? Any ideas?
Thanks in advance
I didn't think it made any difference at first but obviously it does. When running the code in a standalone WPF application it works, however when I try to open the WPF window from a Excel-addin project I get this problem..

Ok! I solved the problem. Turns out it was a focus problem after all.
When the excel addin executed the WPF window the excel window was still in focus. So on every mouseup the focus would jump back from WPF to excel.
All I had to do was change the execution from this:
MainWindow mainWindow = new MainWindow();
mainWindow.Activate();
mainWindow.Show();
to this:
MainWindow mainWindow = new MainWindow();
mainWindow.Activate();
mainWindow.ShowDialog();
Thanks for help anyway guys!

I adjusted your code a tiny bit (DockPanel.Dock="Top" and an extra grid to fill the rest of the dock panel). It works fine and the menu stays open. Does it work for you?:
<Window x:Class="WpfApplication2.Window3"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window3" Height="300" Width="300">
<Grid>
<DockPanel>
<Menu Width="Auto"
IsMainMenu="True" DockPanel.Dock="Top">
<MenuItem Header="Item">
<MenuItem Header="SubItem" />
</MenuItem>
</Menu>
<Grid />
</DockPanel>
</Grid>
</Window>