Disabled checkboxes in Ext.tree

[spiderweb]

How do I make some of the checkboxes to be disabled (blur) in Ext.tree ?

[Condor]

It's not supported by default. You'd have to extend TreeNodeUI to add this feature.

Or would it be acceptable to create these nodes without a checkbox (simply don't specify a checked attribute)?

[spiderweb]

I'm generating the tree "on the fly", so can I use checked : null to generate tree node without checkbox?

[Condor]

Yes (however, I would use checked:undefined).

[spiderweb]

Thank you