deactivating a form

i have two forms in my application form1 and form2  .form1 is large in size and form2 is small ......form1 is open and now i try to open form2....form2 will open...form2 will in front end and form1 will in background but some portion of form1 is visible because its size is larger then form2....i fill my form2 but during this i have click (unwanted click) on visible portion of  form1 now form2 will disappear and form1 will come in front end.... my filled form(form2)will disappear and filled data will removed....   i want if form2 is opened then form1 should not come in front end and form2 should not go in background.....please help me in my problem