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As for 6.5, there is no way how could one plug-in custom Swing Layout to GUI builder -- form project has no public API, registration mechanism is, well, missing. Following packages "feels-like" fine API: org.netbeans.modules.form.codestructure org.netbeans.modules.form.layoutsupport For registering own layouts also LayoutSupportRegistry has to be changed (now it's all hard coded).