I add the method "OnKeyDown" that check if the user pressed on F1. 
If the user pressed on F1 => i call some method that make some action. 

But if the key is not F1 => i need to continue the simple key event ( like add the key value ( char ) to the editbox and so on ) 

How can i continue the simple flow ? 
How to send the key value to the editbox ? 

Thanks