Develop Reference

Flyout - WPF (mahApps)

I'm trying to close a flyout when a click on his or on another side of the window, I use the ExternalCloseButton=Left property. Is this okay? I also tried removing the property AutoCloseEnabled, but could not get results.
When I use a flyout with the property EnabledAutoClose, when closed, the focus is lost in the control it was.
You can help solve this problem?
<mahApps:MetroWindow.Flyouts>
<mahApps:FlyoutsControl>
<mahApps:Flyout Position="Bottom"
AutoCloseInterval="3000"
IsOpen="{Binding IsOpen}"
IsAutoCloseEnabled="True"
ExternalCloseButton="Left">
</mahApps:Flyout>
</mahApps:FlyoutsControl>
</mahApps:MetroWindow.Flyouts>

If you set IsPinned="False" then the Flyout will be closed on left mouse click outside the Flyout.
<Controls:Flyout Height="75"
CloseButtonVisibility="Collapsed"
IsPinned="False"
Position="Bottom"
TitleVisibility="Collapsed">
<TextBlock VerticalAlignment="Center" Text="This is an AppBar" />
</Controls:Flyout>
Sample is from the main demo. Hope this helps.

You can use PreviewMouseLeftButtonUp of the MainWindow or whatever view contains the flyout and set the isOpen to false. If you want to close it only when user clicks the outside of the flyout than you can check it with isMouseOver property of the flyout.

How can I design a region settings like this in WPF

Till now I have a combo-box control which displays all the available region language in the UI as a combo-box items.
its in WPF and MVVM
<ComboBox
x:Name="cbLanguage"
Grid.Row="1"
Height="30"
Width="200"
HorizontalAlignment="Center"
VerticalAlignment="Top"
ItemsSource="{Binding LocalLanguages,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
SelectedIndex="0">
But I saw this window and thought this looks much more legant and modern.
Can I do similar kind of window in WPF.
I tried to change the Combobox with list-box, List-view but no result.
Any help if there is any control in WPF which can do this.
This solves many problem specially if the combo box have more than 10 items user has to scroll through the all and then select the last index. But in this way user can select any locals as all are displayed in the UI. Even user can have the option to display alphabetically.

arraging items in 3 columns can be achieved by using UniformGrid as ItemsPanel
<ComboBox.ItemsPanel>
<ItemsPanelTemplate >
<UniformGrid Columns="3"/>
</ItemsPanelTemplate>
</ComboBox.ItemsPanel>
modify ItemTemplate to change items apperance and have green color for selected item
i think it is necessary to modify ComboBox template to have custom header and footer in a dropDown (Edit Template-Edit a Copy in Visual Studio designer)

In WPF combobox is basically a Popup when the toggle button is pressed.
You could implement your own popup or you could have a look at the template of the ComboBox. Here is a link to ComboBox template

WPF Checkbox - Clicking label does not change checked state

I have a CheckBox in a TabItem Header in a WPF application. I am finding that when you click on the TabItem, it is checking the CheckBox, but not opening the TabItem. I would like only the actual CheckBox to register the click event to change the state from Checked to Unchecked or vice versa. That way, clicking on the label of the CheckBox will open the TabItem.
I've tried using an empty CheckBox that has no content and then a separate Label adjacent to it, but then the TabItem tells me that it cannot have 2 headers.
<TabItem>
<TabItem.Header>
<CheckBox Name="chkExportEnabled" Content="{x:Static resources:Global.Label_Export}" IsChecked="{Binding EnableExport}"/>
</TabItem.Header>
</TabItem>

You can just use a StackPanel with Orientation='Horizontal' around the label-less CheckBox and the Label. TabItem.Header may only contain a single child, that's why you get the error, but nothing prevents you from using layout containers as that child.

WPF: Which solution? TabControl with close button and new tab button

I'm trying to find the best solution for a TabControl that both support a close button on each TabItem, and always show a "new tab button" as the last tab.
I've found some half working solutions, but i think that was for MVVM, that I'm not using. Enough to try to understand WPF =)
This is the best solution I've found so far:
http://www.codeproject.com/Articles/493538/Add-Remove-Tabs-Dynamically-in-WPF
A solution that i actually understand. But the problem is that it is using the ItemsSource, and i don't want that. I want to bind the ItemsSource to my own collection without having to have special things in that collection to handle the new tab button.
I've been search for days now but cant find a good solution.
And I'm really new to WPF, otherwise i could probably have adapted the half done solutions I've found, or make them complete. But unfortunately that is way out of my league for now.
Any help appreciated.

I have an open source library which supports MVVM and allows extra content, such as a button to be added into the tab strip. It is sports Chrome style tabs which can tear off.
http://dragablz.net

This is bit of a dirty way to achieve the Add (+) button placed next to the last TabItem without much work. You already know how to place a Delete button next to the TabItem caption so I've not included that logic here.
Basically the logic in this solution is
To bind ItemsSource property to your own collection as well as
the Add TabItem using a CompositeCollection.
Disable selection of
the Add(+) TabItem and instead perform an action to load a new tab when it
is clicked/selected.
XAML bit
<TextBlock x:Name="HiddenItemWithDataContext" Visibility="Collapsed" />
<TabControl x:Name="Tab1" SelectionChanged="Tab1_SelectionChanged" >
<TabControl.ItemsSource>
<CompositeCollection>
<CollectionContainer Collection="{Binding DataContext.MyList, Source={x:Reference HiddenItemWithDataContext}}" />
<TabItem Height="0" Width="0" />
<TabItem Header="+" x:Name="AddTabButton"/>
</CompositeCollection>
</TabControl.ItemsSource>
</TabControl>
The code behind
private void Tab1_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (e.AddedItems.Contains(AddTabButton))
{
//Logic for adding a new item to the bound collection goes here.
string newItem = "Item " + (MyList.Count + 1);
MyList.Add(newItem);
e.Handled = true;
Dispatcher.BeginInvoke(new Action(() => Tab1.SelectedItem = newItem));
}
}

You could make a converter which appends the Add tab. This way the collection of tabs in you viewmodel will only contain the real tabs.
The problem is then how to know when the Add tab is selected. You could make a TabItem behavior which executes a command when the tab is selected. Incidentally I recommended this for another question just recently, so you can take the code from there: TabItem selected behavior

While I don't actually have the coded solution, I can give some insight on what is most likely the appropriate way to handle this in a WPF/MVVM pattern.
Firstly, if we break down the request it is as follows:
You have a sequence of elements that you want to display.
You want the user to be able to remove an individual element from the sequence.
You want the user to be able to add a new element to the sequence.
Additionally, since you are attempting to use a TabControl, you are also looking to get the behavior that a Selector control provides (element selection), as well as an area to display the element (content) which is selected.
So, if we stick to these behaviors you'll be fine, since the user interface controls can be customized in terms of look and feel.
Of course, the best control for this is the TabControl, which are you already trying to use. If we use this control, it satisfies the first item.
<TabControl ItemsSource="{Binding Path=Customers}" />
Afterwards, you can customize each element, in your case you want to add a Button to each element which will execute a command to remove that element from the sequence. This will satisfy the second item.
<TabControl ...>
<TabControl.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Path=CustomerId}" />
<Button Command="{Binding Path=RemoveItemCommand, Mode=OneTime,
RelativeSource={RelativeSource FindAncestor,
AncestorType={x:Type TabControl}}"
CommandParameter="{Binding}" />
</StackPanel>
</DataTemplate>
<TabControl.ItemTemplate>
</TabControl>
The last part is a bit more difficult, and will require you to actually have to create a custom control that inherits from the TabControl class, add an ICommand DependencyProperty, and customize the control template so that it not only displays the TabPanel, but right next to it also displays a Button which handles the DependencyProperty you just created (the look and feel of the button will have to be customized as well). Doing all of this will allow you to display your own version of a TabControl which has a faux TabItem, which of course is your "Add" button. This is far far far easier said than done, and I wish you luck. Just remember that the TabPanel wraps onto multiple rows and can go both horizontally or vertically. Basically, this last part is not easy at all.

Silverlight RadComboBox Dropdown stays open even when not in focus

I have a user control that contains a scroll viewer. inside the scroll viewer I placed another user control with grid, and inside the grid there is a combo box.
all this is placed inside a RadWindow.
Something like this:
first user control: (displayed inside a RadWindow)
<UserControl x:class = "MyFirstUserControl">
<Grid>
<ScrollViewer>
<StackPanel x:Name="stackPanel"/>
</ScrollViewer>
</Grid>
</UserControl>
second user control:
<UserControl x:class = "MySecondUserControl">
<Grid>
<telerik:RadComboBox x:Name = "comboBox"/>
</Grid>
</UserControl>
in code behind I add the second user control to the stackPanel:
stackPanel.Children.Add(new MySecondUserControl());
Now, the problem is: when the combo-box drop down is open, and I scroll up / down the control - I expect it to close, but- it remains open...
I try to catch the MouseLeftButtonUp event of the scroll bar, and set the IsDropDownOpen of the comboBox to false, but it is false nonetheless and the drop-down still open.
How can I force the drop-down to close when focus is not on it, even if the focus is out of the combo control altogether?
Thanks,