gtk/gtk.go
func (v *ToolItem) SetIsImportant(isImportant bool) {
	C.gtk_tool_item_set_is_important(v.native(), gbool(isImportant))
}
func (v *ToolItem) SetIsImportant(isImportant bool) {
	C.gtk_tool_item_set_is_important(v.native(), gbool(isImportant))
}
// SetIsImportant is a wrapper around gtk_tool_item_set_is_important().