title: Can I use CaretIndex of a TextBox as a CommandParameter in a button?
body: <p>I want a button to insert text that is selected in a listbox to a textbox. I am trying to use command for this, I will pass the current caret index as command parameter, then the Command handler will insert the selected text at this index. Is it possible? I don't know how to refer to aTextBox.CaretIndex in a xaml</p>