How wm_keydown works...?

[cap]

I use this code:
Edit1.Perform(WM_CHAR, VK_BACK, 0)
it works properly but when I change wm_char by wm_keydown

Edit1.Perform(WM_KEYDOWN, VK_BACK, 0)
The edit control ignores it. Do I have to add somethings to lParam?

[Lapince]

When you send WM_CHAR, it's something like WM_KEYDOWN then WM_KEYUP... When you only send WM_KEYDOWN, the edit box "think" the key hasn't been released.