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If I add components to a splitpane, the splitpane automatically resizes. But I can't change the splipane's layout and divider's position with the Matisse GUI Interface. I can't drag the splitbar/divider itself. The only way for layouting splitpanes seems to be by changing the components' sizes in the property inspector. Then I can see the result when I *run* the project, but *not* at design time, i.e. in the Matisse view.
Reassigning to "form" evaluation...
Yes, it would be nice to be able to adjust the divider position via mouse directly. Need to find some trick for the implementation since the GUI builder doesn't allow interacting with the designed components. For now you can try to adjust the dividerLocation property.