+proc make_toplevel {t w args} {
+ upvar $t top $w pfx this this
+
+ if {[llength $args] % 2} {
+ error "make_toplevel topvar winvar {options}"
+ }
+ set autodelete 1
+ foreach {name value} $args {
+ switch -exact -- $name {
+ -autodelete {set autodelete $value}
+ default {error "unsupported option $name"}
+ }
+ }
+
+ if {$::root_exists || [winfo ismapped .]} {