can't send text to a control when the window is hidden

[seco]

hi why this code is not working

Run("notepad.exe","",@SW_HIDE)

WinWait("Untitled - Notepad","")

ControlSend("Untitled - Notepad","","Edit1","hi this is a test")

Sleep(2000)

WinSetState("Untitled - Notepad","",@SW_SHOW)

[seco]

oh it works when i put the controlid 15 instead of Edit1