java - Intellij error with "add non-palette componente" -

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when try add non-palette component in intellij 14.0.3 error:

forms added palette must have binding top-level component

the component try add tab of scrollpane, class extends jpanel.

i can not understand why error. other classes not give me problems.

the error remains if select 2 options.

you may add form pallet , place component on form.

to open in designer form want custom component. click right on group (e.g. swing) , select "add component palette". after can open form , place newly added component on it.


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