disclosure panel within a in a Grid

hi,

Am trying to add a disclosure panel within a custom cell in a grid but
I keep getting this error:

May have only one body element Element <g:DisclosurePanel
animationEnabled='true' debugId='personalInfoPanel' open='true'
visible='true'>

I checked already that a custom cell accepts any child Widget and I
figured that DisclosurePanel will get accepted since it's widget....

Has anybody experienced this problem?

thanks in advance
Patria

PD: putting a horizontal panel within the custom cell works fine...

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