Question

I have created a lookless control using silverlight 4. This control contains a textbox which the user will type data into and a button that increases the size of the textbox by increasing the MinHeight of the control by 10 each time it is pressed (I have set the textbox to stretch so it grows with the control).

This bit works fine but I now want to extend the controls functionality by adding another textbox that will display the current MinHeight of the control which I dont seem to be able to do. I have been trying

Text="{Binding RelativeSource={RelativeSource Self}, Path=MinHeight, Mode=TwoWay}">

Im not sure why but this always shows as 0

Update

In my attempts to resolve I tried chaging the name of the source textbox to PART_sourceData and just to see if the binding was correct I set the path to the text property. This appears to bring through the text of the sourcedata as I would expect

Text="{Binding Mode=TwoWay, ElementName=PART_sourceData, Path=Text}"

My next step was to change the path to Height

Text="{Binding Mode=TwoWay, ElementName=PART_sourceData, Path=Height}"

But this returns NaN. Therefore I tried MinHeight

Text="{Binding Mode=TwoWay, ElementName=PART_sourceData, Path=MinHeight}"

This always returns 0 even though the code behind has a valid number. Whats going wrong? Becuase the text comes through properly I beleive the binding to be correct but whats wrong with getting the height?

Answer 1

Ok I have a solution. Not the best but it works!

I have had to create a new dependancy property

public static readonly DependencyProperty EditorHeightProperty =
        DependencyProperty.Register("EditorHeight", typeof(string), typeof(EditorControl), new PropertyMetadata(default(string)));

    public string EditorHeight
    {
        get { return (string)GetValue(EditorHeightProperty); }
        set { SetValue(EditorHeightProperty, value); }
    }

Then I bind the text to this property using

Text="{TemplateBinding EditorHeight}"