I want to resize Childform in mdi parent when it open

Question

i want to resize the childform in MDI parent, i mean when my PC resolution is Low i.e., 800*600 then the contents of childform and childform, should get small and  compact, again when I change the resolution of my PC to 1280*800 or higher It should automatically be fit like i opened in 800*600... !

please help...! Not anchor or dock problem.... !

i tried both...! please reply as soon as possible...

thank you..