public void CloseSubwindows()
{
if (mergePopup != null)
{
mergePopup.Close();
mergePopup = null;
}
if (removePopup != null)
{
removePopup.Close();
removePopup = null;
}
if (materialPopup != null)
{
materialPopup.Close();
materialPopup = null;
}
if (removeHiddenPopup != null)
{
removeHiddenPopup.Close();
removeHiddenPopup = null;
}
}
