WPF keyboard input question

programming
1

[FONT=Times New Roman][SIZE=3]Ok I just started developing using Windows Presentation Foundation and have a little problem adding a shortcut key ability to my app. The problem is that I have my main panel throw a KeyDown event everytime a key is pressed. In the code for “keyDown” I then handle a few special conditions (user pressing crtl + a char). [/SIZE][/FONT]
[FONT=Times New Roman][SIZE=3]I am using the code from a Kirupa article[/SIZE][/FONT]

 
public void keyDown(object sender, KeyEventArgs e)
{
// Ctrl + B 
if ((Keyboard.Modifiers == ModifierKeys.Control) && (e.Key == Key.B))
{
MessageBox.Show("bold");
}
// Ctrl + U 
if ((Keyboard.Modifiers == ModifierKeys.Control) && (e.Key == Key.U))
{
MessageBox.Show("underline");
}
// Ctrl + L 
if ((Keyboard.Modifiers == ModifierKeys.Control) && (e.Key == Key.L))
{
MessageBox.Show("link");
}
// Ctrl + R 
if ((Keyboard.Modifiers == ModifierKeys.Control) && (e.Key == Key.R))
{
MessageBox.Show("random");
} 
}

[FONT=Times New Roman][SIZE=3]The problem is that if my cursor is in a TextBox, and I press a crtl+b, it will get handled by the KeyDown and the ‘B’ will get inputed into the TextBox. How can I prevent this behavior. Obviously I do not want the ‘B’ to get typed into the TextBox if one of the special conditions in my keyboardEvents method is met.[/SIZE][/FONT]