Key Modifiers not working ?

Hi, I have read various questions relating to Key Modifiers but nothing I do seems to work.

I am trying to click into a field, highlight the entire contents of the field and delete it prior to entering my own value.

thus my code look slike this;

click( <image> ) #this works ok
type( Key.HOME )
type( Key.END, KeyModifier.SHIFT )
type( Key.BACKSPACE )

Unfortunately the SHIFT does not seem to "take", so instead of highlighting the contents of the field the cursor just moves to the end of the field.

What am I doing wrong?