image in picture box dissappears on resize

[gvgeowiz]

My c# program is using a c++ dll to load an image from an avi clip and display it to a picture box via the picturebox.handle. To draw the picture I call the c++ function passing to it the picturebox.handle.
My problem comes when I need to resize the form (or when another window covers this). I have set the picturebox to resize with the form. I have events for Form_Resize and Form_Paint, which call the c++ function to draw the image. When I resize the form this is what I see in the stated order:
1. The picture box resizes properly
2. Then I seee the image drawn to the new size
3. Then the image dissappears.

Any suggestions, thanks!

 

[DaZZleD]

post some code so we can have a look

 

[gvgeowiz]

The code is pretty simple and always works when I press button1. (also it works always in VB6, on resize as well) But I cannot get it to redraw using the form1_Resize event. The form and the picturebox redraw fine, but the image just flashes to the picturebox and then is gone. When I press button1 again the image draws just fine.
Is there a different event where I should place GT.ShowPic? It almost seems as if windows is calling another event after the form_resize event that causes the picturebox to go blank

private m_spath = "d:\\video\\testvideo.avi"
//Pic1 = a picturebox where I am trying to draw the image
private void button1_Click(object sender, System.EventArgs e)
{
//this method works great, it displays the image as expected
int lwdt=Pic1.Width;
int lhgt=Pic1.Height
//DisplayImg is a direct dll call
int lres = GT.ShowPic(m_spath, (int)m_lhwnd, lwdt, lhgt, m_lframe); //opens video(spath) and displays a frame(m_lframe) to the dc(m_lhwnd). The image is drawn in the dc starting at pixel 0,0, and drawn the specified height and width(lhgt,lwdt)
}

private void Form1_Resize(object sender, System.EventArgs e)
{
//resize Pic1 with the form
Pic1.Width=this.Width-Pic1.Left-10;
Pic1.Height=this.Height-Pic1.Top-30;
//display the image
int lwdt=Pic1.Width;
int lhgt=Pic1.Height
//DisplayImg is a direct dll call
int lres = GT.ShowPic(m_spath, (int)m_lhwnd, lwdt, lhgt, m_lframe); //see private void button1_Click fro details on parameters
}

 

[gvgeowiz]

It seems like I'm not anticipating/understanding some windows event. Because If, after a resize, I place a different window partially over my form and then move it more off my form, then part (yes only part) of the visible image appears. I've tried putting having form_paint and Pic1_paint and Pic_resize and form_resize all call GT.Show and none of these will redraw the image.

Help....