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This bug was originally marked as duplicate of bug 197466, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 7.3 Beta 2 (Build 201211062253) VM: Java HotSpot(TM) 64-Bit Server VM, 23.6-b04, Java(TM) SE Runtime Environment, 1.7.0_11-b21 OS: Linux User Comments: dkonecny: I dragged several components into separate jpanel Stacktrace: java.lang.IllegalArgumentException: illegal component position at java.awt.Container.addImpl(Container.java:1080) at java.awt.Container.add(Container.java:460) at org.netbeans.modules.form.layoutsupport.AbstractLayoutSupport.addComponentsToContainer(AbstractLayoutSupport.java:621) at org.netbeans.modules.form.layoutsupport.LayoutSupportManager.addComponentsToContainer(LayoutSupportManager.java:664) at org.netbeans.modules.form.VisualReplicator.addComponent(VisualReplicator.java:394) at org.netbeans.modules.form.VisualReplicator.updateAddedComponents(VisualReplicator.java:360)
Created attachment 130909 [details] stacktrace
Reported for 7.3.x or earlier, no new info since then -> closing as worksforme, please reopen in case you see it.