GTK : How to set the Height of a VBox?

Hi I'm making an app using GTKMM. The screenshot is below: Screenshot The Problem is, I'm not able to position the "My Label" to align at the top, just below the Search box. I'm packing Name,Search box, Search Button into a HBox, which is packed into a VBox, and then MyLabel is packed into the VBox. I think the problem is that the VBox is assigning equal heights to the two rows, So even though I align MYLabel to the top, but it's top is the middle of the screen 'cuz VBox distributed the heights between the two rows equally. Is there a way to set the Heights of the VBox rows?? or any other way out?