Hi Peter,

Thank you for your interest in our RadDocking control for WPF.

What comes to my mind is to subscribe to the PaneStateChange event of the control. In the event handler, you could try to reset/update the DataContext.

Give it a try and let me know if it works for you. 

Regards,
Dinko
Progress Telerik

Hello Dinko,

thank you very much for your reply.

I missinterpreted the issue, the binding error comes from another source. In my RadPane, I have a WatermarkTextBox with a clear button in it, like so:

When the RadPane is hidden on start up, I get the following binding error:

Cannot find source for binding with reference 'ElementName=_ctlTextBox_Filter'. BindingExpression:(no path); DataItem=null; target element is 'RadButton' (Name=''); target property is 'CommandTarget' (type 'IInputElement')
System.Windows.Data Error: 4 : Cannot find source for binding with reference 'ElementName=_ctlTextBox_Filter'. BindingExpression:Path=Text; DataItem=null; target element is 'RadButton' (Name=''); target property is 'Visibility' (type 'Visibility')

When I visualize the RadPane again, the clear button is still visible although no text was entered. I can use the Loaded-Event of my UserControl to hide the clear button again, but I don't know what.

Can you help me with that?

Thanks!

Tobias

Hello Peter,

Thank you for the provided code snippet.

I have observed the error. When the pane is added and hidden, the RadWatermarkTextBox is still not loaded but the binding is evaluated. You can work around this by using the AdditionalContentTemplate property. This way the binding will be evaluated when the control is loaded.

<telerik:RadWatermarkTextBox x:Name="_ctlTextBox_Filter" Width="120"
                        TextChanged="OnTextBoxFilterTextChanged"
                        WatermarkContent="{lex:Loc IDS_NO_FILTER_ACTIVE}"
                        WatermarkBehavior="HideOnTextEntered">
    <telerik:RadWatermarkTextBox.AdditionalContentTemplate>
        <DataTemplate>
            <telerik:RadButton Padding="0" Margin="0,4"
                    Command="telerik:RadWatermarkTextBoxCommands.Clear"
                    CommandTarget="{Binding ElementName=_ctlTextBox_Filter}"
                    IsBackgroundVisible="False"
                    Visibility="{Binding Text, ElementName=_ctlTextBox_Filter, Converter={StaticResource NullToVisibilityConverter}}">
                <telerik:RadGlyph Glyph="{StaticResource GlyphClose}"/>
            </telerik:RadButton>
        </DataTemplate>
    </telerik:RadWatermarkTextBox.AdditionalContentTemplate>
</telerik:RadWatermarkTextBox>

Using the above approach I did not observe any binding error on my side. Give this a try and let me know how it goes.

Regards,
Dinko
Progress Telerik

Hello Dinko,

that does the trick, thank you very much!

Cheers!

Tobias