Question

I need to create control wich can show items over itself (just dont clip them if there is no space)

All textblocks added to grid. Grid and control has property ClipToBounds = false.
Why items clipped by control in my case?

   <Style TargetType="{x:Type local:SomeControl}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type local:SomeControl}">
                <!-- Root Grid-->
                <Grid x:Name="LayoutRoot"
                      Background="{TemplateBinding Background}">
                    <Grid x:Name="TicksHolder"
                          ClipToBounds="False"
                          Background="Transparent" >
                 <!-- Items Dynamically added here-->
                    </Grid>
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

And as you can see from image only right border clips items. rectangles out of right border doesnot clipped!

I found how to reproduce with more simple code:

      <Grid HorizontalAlignment="Left" Height="112" VerticalAlignment="Top" Width="52">
                <TextBlock TextWrapping="Wrap" Text="TextBlock" Width="78" Margin="37,0,0,0"/>
            </Grid>

And also i noticed that Grid clips content and Canvas is not

Answer 1

I Think that only one way out is to use Canvas instead of grid