When the RadNumericUpDown is in focus, I'd like to update the source in VM. I created a simple method to grab the focused element from the keyboard and update the source. The problem is the Keyboard.FocusedElement returned a type called PickerTextBox instead of RadNumericUpDown and thus the highlighted codes won't be fired. My question is how I can UpdateSource to NumericUpDown properly? The original problem is when the RadNumericUpDown is in focus and user saves the app, the RadNumericUpDown source won't be updated.
private void UpdateFocusedTextBox()
//There is an issue when textbox is in focus, it won't update the source.
//This workaround will try to find the currently focusedTextBox and update the source.
object focusedTextBox = Keyboard.FocusedElement;
if (focusedTextBox is RadNumericUpDown)
RadNumericUpDown rad = focusedTextBox as RadNumericUpDown;
else if(focusedTextBox is TextBox)