Help me with event handling with this GUI

Here is the sequence of my GUI

LOG IN FORM

-asks for username and pw

if the username and pw is correct it will display the MAIN PAGE

else it will display ,Please Check your username and pw.

MAIN PAGE

contains 4 button with specific task

will someone kindly help me how to get the correct event handling for this once the user log in successfully..it will display the Main Form...hope to hear from you guys.

[456 byte] By [ryshi1264a] at [2007-11-27 3:56:28]