I propose a little conceptual change of the visual designer:
1. "Add view" list gets a permanent position, more comfortable
2. Position of "Abstract designer" panel and the properties panel is changed. Designer is better positioned to the Add view items
3. Selector: WYSIWYG panel OR Properties. Simpler design, two windows instead of three. Mode1: "Add view"->"Designer"->"WYSIWYG" line is more logical if you want to design GUI items. Mode2: "Add view"->"Designer"->"Properties" to fine tune GUI and properties.
What do You think about this....?