How To Set Selected Option For PropertySelection Component ?

[Dwi Ardi Irawan]

i got a form that contain PropertySelection
i want when i change to edit Mode (DirectLink with parameter)....
the PropertySelection automatically to be set based on the parameter 
that i give in HTML

Grid(send the parameter) -> From (Edit Mode set the selected of 
propertySelction)
example
paramater : "a"
propertySelection = {"a", "b", "c"}

when i klik the DirectLink the "a" would be the selected of 
propertySelection

could anyone help me ?