Load the child form on the top of the control

Hi all i have my main form as MDI form on this form i am having data grid view. Now form selecting an option from file menu i am loading a child form and i set the property

      startposition=center

It is getting loaded but some part of the form is getting loaded below the data grid view how to over come this . A sample form is attached bel开发者_如何学运维ow

Solved by using this

               f.ShowDialog(this);