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Convert the Ruby data structure data into tree model data for Gtk and returns the whole model. If the parameter model wasn‘t given a new Gtk::TreeStore is created as the model. The parent parameter specifies the parent node (iter, Gtk:TreeIter instance) to which the data is appended, alternativeley the result of the yielded block is used as iter.

Opens an error dialog on top of window showing the error message text.

Returns the Gdk::Pixbuf of the icon named name from the icon cache.

Convert the tree model starting from Gtk::TreeIter iter into a Ruby data structure and return it.

Opens a yes/no question dialog on top of window showing the error message text. If yes was answered true is returned, otherwise false.

[Validate]