Exposing Child Control Dependency Properties for Binding in WPF
.net, custom-controls, dependency-properties, wpf, xaml
Solution
1.in the code behind of your control create a new DP ,say we call it Text 2. in the xaml from your code :
<TextBox x:Name="InnerTextBox" Text={Binding Text}/>
3.make sure that the DataContext of the textBox is the UserControl
Problem
I have a very simple `UserControl` called `CustomTextBox` with this XAML: ``` <UserControl x:Class="CustomTextBox" ... > <Grid> <TextBox x:Name="InnerTextBox"/> </Grid> </UserControl> ``` Now when I use `CustomTextBox` and want to do binding to `InnerTextBox.Text`, it does not work: ``` ... {Binding ElementName=CustomTextBox, Path=InnerTextBox.Text} ``` I tried it another way, does not work as well: ``` ... {Binding ElementName=CustomTextBox.InnerTextBox, Path=Text} ``` I know I can define a new dependency property called `CustomTextBox.Text` and then bind it to `InnerTextBox.Text` but I am planning to have custom controls with many properties and it is hell of a work to copy all of them just to support binding. Furthermore, copying/wrapping properties means each value is stored twice. In WinForms, this was a matter simple inheritance and all the properties were available automatically. In WPF, inheritance of XAML controls is not possible and the properties are inaccessible. Is there any simple way on how to set up binding from some control to `UserControl`'s child element property?