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The main form should be displayed as soon as possible to ensure a timely response for the user. You can then check authorizations, fetch data, and display status messages while the main form is in a locked state.
Template startup procedure: UiStart
proc UiStart {} {
	global appvals
	# Open/connect to widget server
	set vtApp [VtOpen $appvals(client)]
	set appvals(vtApp) $vtApp
	VtSetAppValues $vtApp \
                -versionString "$appvals(title) $appvals(version)" \
                -errorCallback {SaUnexpectedErrorCB {}}
	if {$appvals(openhost)} {
		set title \
	"$appvals(title) [IntlMsg ON] [SaHostExtractSystemName $appvals(managedhost)]"
	} else {
		set title "$appvals(title)"
	}
	# Create main dialog
	set vtMain [VtFormDialog $vtApp.main \
			-title $title \
			-wmShadowThickness 0 \
			-wmCloseCallback UiCloseCB]
	set appvals(vtMain) $vtMain
	VxSetVar appvals(vtMain) vtMain $vtMain
	UiDefaultFormSpacingSet $vtMain
	SaCharmSetMaxFormDimensions $vtMain
	# Build pulldown menus
	set menuBar [UiBuildMenus $vtMain]
	VxSetVar $appvals(vtMain) menuBar $menuBar
	# Build the toolbar
	if {! [VtInfo -charm]} {
		if {$appvals(toolbar)} {
			set toolbar [UiBuildToolBar $vtMain $menuBar]
		}
	}
	# Main form label (vs. title)
	set mainlabel [VtLabel $vtMain.mainlabel \
		-label "$appvals(title) [IntlMsg ON] $appvals(managedhost)"]
	VxSetVar $appvals(vtMain) mainlabel $mainlabel
	# TODO: build main screen widgets here.
	# Basic drawnlist is provided as a sample
	# Pass main form and widget just above for attachments
	if {$appvals(who)} {
		set mainList [UiBuildMainList $vtMain $mainlabel]
	}
	# Build the status bar
	# Standard SCOadmin status bar pixmap
	set logofile {}
	# Full pathname for non-SCOadmin status bar pixmap
	# set logofile "?"
	if {[lempty $logofile]} {
		set statusBar [SaStatusBar $vtMain.statusBar 1]
	} else {
		set statusBar [SaStatusBar $vtMain.statusBar 1 $logofile]
	}
	VxSetVar $appvals(vtMain) statusBar $statusBar
	# Connect main screen widget bottom to statusbar
	if {$appvals(who)} {
		VtSetValues $mainList -bottomSide $statusBar
	}
	# Display the main form and lock it
	VtShow $vtMain
	VtLock
}