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Access Control On Mdi Parent

Hi everyone,
i am trying to set control on mdi form from mdi child:
trying to set toolstrip on mdi parent (MDIMain) from child form doing this
way on the child form:

ToolStrip Tool = ((MDIMain)this. MdiParent).tool Strip;
Tool.Enabled = false;
or this way
((MDIMain)this. MdiParent).tool Strip.Enabled = false;

gives me error:
Object reference not set to an instance of an object.

what should i do or is there different way to access controls on mdi form
from the children forms?
thanks
Oct 24 '07 #1
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