CSliderCtrl, SetBuddy() moves my custom control to out of computer screen

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C++

MFC

VisualC++

Hi,

I've 2 sliders (1 horizontal, 1 vertical) control and a custom control in my program.
The sliders are position at the bottom and right of the custom control.

When I setbuddy() to the custom control. The custom control will move to the bottom right of my computer screen. I've than moved the custom control back to its original position using MoveWindow().

But when I lock my computer using the "windows-key + L", and log back in. the custom control, moves back to the bottom right of my computer screen.

Can anyone tell me why? And how can i solve this problem?
Thanks for your help!

[EDIT]

m_sliderHorizontal.SetBuddy(&m_ChartCtrl, FALSE);
m_slidervertical.SetBuddy(&m_ChartCtrl, FALSE);

where m_ChartCtrl is the custom control.

I've tried all possible combinations of the BOOL parameters. But it still moves the custom control after i lock and log-in again. Is there anyway to lock the custom control position?