Disable tab panel item in Xojo
You can simply use code like this on MacOS:
dim n as NSTabViewMBS = TabPanel1.NSTabViewMBS
dim it as NSTabViewItemMBS = n.tabViewItemAtIndex(2)
it.Enabled = me.Value
dim it as NSTabViewItemMBS = n.tabViewItemAtIndex(2)
it.Enabled = me.Value
You can use NSTabViewItemMBS and NSTabViewMBS classes to access the enabled property there and turn item on/off when appropriated.