WinApi: ENTER is not send

Hi,

I'm trying to write a text into a textfield and simulate the ENTER button. This field is inside a java applet.

However, ENTER is ignored. The text is written in the field, but ENTER is not pressed. Can you please help me?

The site is knuddelz.de, I want to fill out the fields and press enter.
vbnet Code:
SendMessage(&H500932, WM_SETTEXT, 0, "myNickname")
SendMessage(&H1E05FE, WM_SETTEXT, 0, "myPassword")
SendMessage(&H160A52, WM_SETTEXT, 0, "myRoom")
 
SendMessage(&H160A52, WM_CHAR, WM_ENTER, 0&)
In case of success, a small window would appear.

Thanks.