display a minimized window when another is showing

hi every one

i have form named mainform ,which consist of timer control named as t1
in t1_tick
iam checking the timer time
suppose if its 1 hour iam displaying another window which will display after an hour your application will close automatically.
but when the timer starts iam minimizing that first form(mainform), so whenver second form is showing we need to show first form(main form) and then secondform.
in timer i used 
this.bringtofront()
this focus()
but it is not displaying. 


warm regards
arif sharif