Whitespace at the top of cfwindow popups

Question

I have several instances where I am using cfwindow to create
a window and the popup comes with a large amount of whitespace
above the page, thus pushing the page just below the size of the
window.
If the popup page is resized just a tiny bit, the page
'jumps' into place without whitespace and all works as was
originally intended.
Any thoughts on how to get rid of this problem would be
greatly appreciated.

Answer 1

I have tried the cfsilent.
When the popup page is opened in a window of its own; there
is no whitespace at the top.
And the whitespace disappears once the window is manually
adjusted, so it is not true whitespace, but only present
temporarily.
The code I use to build the popup is:
<cfwindow center="true" width="800" height="600"
name="WinMyIdea" title="PO List" refreshOnShow="true"
initshow="false" modal="true"
source="index.cfm?action=compilation_add_po&ID={comp:DYN_FORM_VAL}"
/>
<script>
<!--
function showIdea(theID) {
comp.DYN_FORM_VAL.value = theID;
ColdFusion.Window.show('WinMyIdea');
-->
</script>