Lets a registered pane build itself, just before a host adopts it.
Called by every host on every open. A throw is swallowed: an owner that fails to build is a
defect in that owner, and taking the whole panel — legend and layers included — down with it
would be a worse answer than an empty tab.
Lets a registered pane build itself, just before a host adopts it.
Called by every host on every open. A throw is swallowed: an owner that fails to build is a defect in that owner, and taking the whole panel — legend and layers included — down with it would be a worse answer than an empty tab.