Resize inner control with dialog

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MFC

VisualC++

In mfc dialog based application i draw one graph on picture control and plot points as i needed,but problem is whenever i resize dialog that picture control remained as it is and looked weired! I can write some code on event of 0nSize() of dialog but it only resize other controls except picture control, so how to make changes on event of size changes of dialog?

RECT rc;
GetClientRect(&rc);
rc.top+=25;
rc.bottom-=80;
rc.left+=15;
rc.right+=15;

GetDlgItem(IDC_PIC1)->MoveWindow(&rc);

Above i paste some code which i tried so much but not working,please give me any idea for that!