How to: Create a GridSplitter, that customizes the size of a DockPanel (C#, WPF)

Question

How to: Create a GridSplitter, that customizes the size of a DockPanel (C#, WPF)

This is my GridSplitter code, but unfortunately it is not working: I am not allowed to change the size of my grid. I can see the GridSplitter, but I cannot use it.

<DockPanel DockPanel.Dock="Left" Name="dockPanel_1" Width="200">
    <StackPanel />
    <DockPanel />
</DockPanel>
<Grid>
    <GridSplitter ShowsPreview="True" Width="5" HorizontalAlignment="Right" VerticalAlignment="Stretch" />
</Grid>
<DockPanel DockPanel.Dock="Right" Name="dockPanel_2">
    <StackPanel />
    <DockPanel />
</DockPanel>

PS: If you know how to save the changed size, so that its to the same size when restarting the application, just add to your post.

Thanks in advance.

Answer 1

If you want to be able to resize columns/row then instead of DockPanel you can use Grid with GridSplitter

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="200"/>
        <ColumnDefinition/>
    </Grid.ColumnDefinitions>
    <DockPanel Name="dockPanel_1">
        <StackPanel />
        <DockPanel />
    </DockPanel>
    <GridSplitter Width="5" HorizontalAlignment="Right" VerticalAlignment="Stretch" ResizeBehavior="CurrentAndNext"/>
    <DockPanel Grid.Column="1" Name="dockPanel_2">
        <StackPanel />
        <DockPanel />
    </DockPanel>
</Grid>