Develop Reference

RadCartesianChart Setting

I use Telerik component for serial port plot data on chart, I need to know how can i have more space between X-Axis item now x-axis show compressed and i need to know if the plot point increase how can add chart auto scroll,this is my XAML code :
<telerik:RadCartesianChart x:Name="myChart" ScrollViewer.HorizontalScrollBarVisibility="Auto">
<telerik:RadCartesianChart.Grid>
<telerik:CartesianChartGrid/>
</telerik:RadCartesianChart.Grid>
<telerik:RadCartesianChart.HorizontalAxis>
<telerik:CategoricalAxis IsStepRecalculationOnZoomEnabled="True" LabelOffset="0" LastLabelVisibility="Visible" LineThickness="1" MajorTickOffset="0" MajorTickLength="5" MajorTickInterval="1" PlotMode="BetweenTicks" SmartLabelsMode="None" TickThickness="1" ZIndex="0"/>
</telerik:RadCartesianChart.HorizontalAxis>
<telerik:RadCartesianChart.VerticalAxis>
<telerik:LinearAxis BorderThickness="0,4,0,0">
<telerik:LinearAxis.BorderBrush>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="Black" Offset="0"/>
<GradientStop Color="#FF0E0EF5" Offset="1"/>
</LinearGradientBrush>
</telerik:LinearAxis.BorderBrush>
<telerik:LinearAxis.Background>
<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
<GradientStop Color="Black" Offset="0"/>
<GradientStop Color="#FFE41F1F" Offset="1"/>
</LinearGradientBrush>
</telerik:LinearAxis.Background>
</telerik:LinearAxis>
</telerik:RadCartesianChart.VerticalAxis>
</telerik:RadCartesianChart>
I was push my project to Github

I found my answer, Add those tag to radCartesianChart root element
ScrollViewer.HorizontalScrollBarVisibility="Auto"
HorizontalZoomRangeStart="0.9"
HorizontalZoomRangeEnd="1"
Complete format :
<telerik:RadCartesianChart
x:Name="myChart"
ScrollViewer.HorizontalScrollBarVisibility="Auto"
HorizontalZoomRangeStart="0.9"
HorizontalZoomRangeEnd="1"
Margin="0,0,445,162">

WPF Border Color Binding to parent Controls Tag

I have a problem where I have to bind to Tag property. But don't know what will come here.
<Border x:Name="BorderStatus" CornerRadius="2" Tag="Transparent">
<Border.Background>
<LinearGradientBrush>
<GradientStop Color="{Binding Tag, ????}" Offset="0"/>
<GradientStop Color="{Binding Tag, ????}" Offset="0.47"/>
<GradientStop Color="Red" Offset="0.77"/>
<GradientStop Color="DarkRed" Offset="1"/>
</LinearGradientBrush>
</Border.Background>
</Border>
This is done cause there are triggers which will change the tag property.
We can bind with ElementName but is there any other way?

Two ways of accomplishing your goal I can think of are these:
I. Use Binding.ElementName property:
Color="{Binding Tag, ElementName=BorderStatus}"
II. Use RelativeSource in FindAncestor mode:
Color="{Binding Tag, RelativeSource={RelativeSource FindAncestor, AncestorType=Border}}"

Execution order of element properties in xaml

Is there a way to execute attached behavior last, after initialization of list properties in following example
<LinearGradientBrush local:FreezeBehavior.IsFrozen="True">
<GradientStop Color="Black" Offset="0"/>
<GradientStop Color="White" Offset="1"/>
</LinearGradientBrush>
It can be done like this
<GradientStopCollection x:Key="SomeKey">
<GradientStop Color="Black" Offset="0"/>
<GradientStop Color="White" Offset="1"/>
</GradientStopCollection>
<LinearGradientBrush GradientStops="{StaticResource SomeKey}" local:FreezeBehavior.IsFrozen="True"/>
But it will require to create dozens of unnecessary ResourceDictionary entries.
P.S.: related question (in case someone see this as duplicate, then vote close it instead of this one, here I already know the problem and it's more clearly described).

I guess execution flow is based on XAML Parser, and in parse properties as they appear. So you can try to reorder declarations of properties. Something like this:
<LinearGradientBrush>
<GradientStop Color="Black" Offset="0"/>
<GradientStop Color="White" Offset="1"/>
<local:FreezeBehavior.IsFrozen>True</local:FreezeBehavior.IsFrozen>
</LinearGradientBrush>
May be you'll have to use <sys:Bool>True</sys:Bool> as value of FreezeBehavior.IsFrozen

How offset works

I want to know that, How offset works in WPF in GradientStop
<Grid.Background>
<LinearGradientBrush>
<GradientStopCollection>
<GradientStop Color="Black" Offset="0" />
<GradientStop Color="Red" Offset="1" />
</GradientStopCollection>
</LinearGradientBrush>
</Grid.Background>

I'm pretty sure it's the point at which the gradient switches completely over to the next color. So something like:
<Rectangle Width="200" Height="100">
<Rectangle.Fill>
<LinearGradientBrush StartPoint="0,0" EndPoint="1,1">
<GradientStop Color="Yellow" Offset="0.0" />
<GradientStop Color="Red" Offset="0.25" />
<GradientStop Color="Blue" Offset="0.75" />
<GradientStop Color="LimeGreen" Offset="1.0" />
</LinearGradientBrush>
</Rectangle.Fill>
</Rectangle>
from 0 to 25% of the rectangle will flow from yellow to red. 25% to 75% of the rectangle will flow from red to blue. From 75% - 100% the rectangle will be blue to lime green.
So in your example, the color will go from black to red, with the colors only being completely black at the start and completely red at the end.

StartPoint has default value 0,0 and EndPoint has default value 1,1. As you have not specified StartPoint and EndPoint, these values are implicitly used. See http://msdn.microsoft.com/en-us/library/system.windows.media.lineargradientbrush(v=vs.110).aspx
Finally, it is important to note that brushes have a BrushMappingMode property which defaults to RelativeToBoundingBox. As you have not specified that, RelativeToBoundingBox is used and offset determines the position of the color between your endpoints. Another option is Absolute, which is where the magnitude of EndPoint-StartPoint starts mattering.
When you specify a gradientstop at offset 0.3 using BrushMappingMode RelativeToBoundingBox, you're specifying the color of the linear gradient 30% between StartPoint and EndPoint.

Linear Gradient Brush Fade WPF

I have a brush that colors the background of a header. I like the way the brush looks but would like it to fade to transparent in the bottom third. Any ideas how to do this?
<LinearGradientBrush
x:Key="HeaderBackgroundBrush"
EndPoint=".5,1"
StartPoint="1,0">
<GradientStop Color="#006699" Offset="1"/>
<GradientStop Color="#80A8CC" Offset="0.5"/>
</LinearGradientBrush>

I'm not sure you can do it by working only at the brush level, however you could apply an OpacityMask to your control:
<LinearGradientBrush
x:Key="HeaderBackgroundOpacityMask"
StartPoint="0,0"
EndPoint="0,1">
<GradientStop Color="#FFFFFFFF" Offset="0"/>
<GradientStop Color="#FFFFFFFF" Offset="0.667"/>
<GradientStop Color="#00FFFFFF" Offset="1"/>
</LinearGradientBrush>
...
<Border Background="{StaticResource HeaderBackgroundBrush}"
OpacityMask="{StaticResource HeaderBackgroundOpacityMask}">

just specify the colors as ARGB (including alpha) like this: #AARRGGBB. Then give your last gradient stop an alpha value of 0 (fully transparent; in your case #0080A8CC). HTH.

If you want to do it in C# use the following code. This will give you a light pink/salmon to fully transparent brush. Change the #FF and #00 to get a different transparency gradient.
var startColour = (SolidColorBrush)new BrushConverter().ConvertFrom("#FFff99a8");
var endColour = (SolidColorBrush)new BrushConverter().ConvertFrom("#00ff99a8");
_dirtyColourBackground = new LinearGradientBrush(startColour.Color, endColour.Color,new Point(0,0),new Point(1,0));