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You should treat the event QueryPopup
and modify the popup size by assigning a Size
with the values you wish:
private void gridLookUpEdit1_QueryPopUp(object sender, CancelEventArgs e) {
GridLookUpEdit editor = (GridLookUpEdit)sender;
RepositoryItemGridLookUpEdit properties = editor.Properties;
// mudando apenas a largura, mas não a altura, por exemplo:
properties.PopupFormSize = new Size(500, properties.PopupFormSize.Height);
}