Problem in property grid

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C#

C#4.0

Hello all,
On the left side of my page we have created toolstrip, with that we have panel & property grid. we have images in toolstrip when i click on the image. image goes to panel where we can large the image and assigning the values of image to property grid with these line of code.

propertyGrid1.SelectedObject = (sender as System.Windows.Forms.PictureBox);

Now my problem is when click on the image it move slightly. we want to stop that click of image. Please help me.

Thanks in advance.
Sanjeev