Owner-draw ComboBox - Event subscribtion and raising point

Hello,

I was implementing an owner-draw ComboBox, which should render long items multiline. I'm using MeasureItem and DrawItem the following way (important lines marked with comments):

class MultiLineComboBox
 : ComboBox {
       ...
protected override void InitLayout() // (1) Method selection explained below.
{
	base.InitLayout();
	MeasureItem += new MeasureItemEventHandler(MultiLineComboBox_MeasureItem);
	DrawItem += new DrawItemEventHandler(MultiLineComboBox_DrawItem);
}

void MultiLineComboBox_MeasureItem(object sender, MeasureItemEventArgs e)
{
	string itemText = Items[e.Index].ToString();
	int textWidth = DropDownWidth - ItemPadding.Horizontal - SystemInformation.VerticalScrollBarWidth;
	e.ItemHeight = 
		ItemPadding.Vertical + 
		(int)(e.Graphics.MeasureString(itemText, Font, textWidth).Height);
	e.ItemWidth = ItemPadding.Horizontal + textWidth; // (2)
}

void MultiLineComboBox_DrawItem(object sender, DrawItemEventArgs e)
{
	if (e.Index < 0) return;

	e.DrawBackground();
	e.Graphics.DrawString(  // (3)
		Items[e.Index].ToString(), Font, SystemBrushes.FromSystemColor(e.ForeColor), e.Bounds, itemFormat);
}
}

The first problem is, when I set item width to, say, 250 at (2), I get, say, 350 as e.Bounds.Width at (3) --- actual numbers vary --- so that I draw the text into a wider rectangle than it was supposed to. My best guess is that MeasureItem is raised before DropDownWidth is set to a correct value. So, my question is: where do I have to place subscribtion to this event in order to perform measurment with proper values?

Placing the ComboBox inside a UserControl and subscribtion in OnLoad of the latter may help (though I'd prefer to subclass ComboBox), but this won't solve the second question: how do I issue a command for windows to measure all the items again (raising MeasureItem) when the ComboBox is resized, for example?

Thanks in advance.