How to detect selection in Combo Boxes instead of click.

i have 2 groups in powershell script. 1 has series of combo boxes select options from, , second displays combined result selected combo boxes. trying use $combobox1.add_click detect when update second group, update not happening when select item, updating when click item (prior selection). when review class system.windows.forms.combobox, don't see add_click, guessing add_click alias event click?

1. what should using instead of add_click?
2. am right add_click same click?
3. if events not should looking for, how can list of options similar add_click?

[void] [system.reflection.assembly]::loadwithpartialname("system.drawing")   [void] [system.reflection.assembly]::loadwithpartialname("system.windows.forms")     $buildings = @("a - nice","b - less nice","c - terrible")    $objform = new-object system.windows.forms.form   $objform.text = "enter new computer name"  $objform.size = new-object system.drawing.size(550,400)   $objform.startposition = "centerscreen"    #--group1 positions----------------------------------  $gpp1 = 25    #-- defaultmachine name group box----------------------  $group1 = new-object system.windows.forms.groupbox  $group1.location = new-object system.drawing.point(30,30)  $group1.size = new-object system.drawing.size(500,90)  $group1.text = "standard computer name"  $group1.enabled = $true    #--building label------------------------------------  $g1label1 = new-object system.windows.forms.label  $g1label1.location = new-object system.drawing.point(40,$gpp1)  $g1label1.size = new-object system.drawing.size(120,15)  $g1label1.text = "building"  $group1.controls.add($g1label1)    #--building------------------------------------------  $g1combo1 = new-object system.windows.forms.combobox  $g1combo1.location = new-object system.drawing.point(40,($gpp1+20))  $g1combo1.size = new-object system.drawing.size(120,20)  $g1combo1.items.addrange([system.object[]]($buildings))  $g1combo1.selectedindex = 0  $group1.controls.add($g1combo1)    #--custom machine name group box-----------------------  $group3 = new-object system.windows.forms.groupbox  $group3.location = new-object system.drawing.point(30,215)  $group3.size = new-object system.drawing.size(500,60)  $group3.text = "custom computer name"  $group3.enabled =  $false    #--building label------------------------------------  $g3label1 = new-object system.windows.forms.label  $g3label1.location = new-object system.drawing.point(30,$gpp1)  $g3label1.size = new-object system.drawing.size(300,15)  $g3label1.text = $null  $group3.controls.add($g3label1)      $clickactions = {           $g3label1.text = (($g1combo1.selecteditem).substring(0,1))           }  #--this wrong response--------  $g1combo1.add_click($clickactions)      $objform.controls.add($group1)  $objform.controls.add($group3)  [void] $objform.showdialog()  

so found .net developer helped me sort out little bit. modified add_click line add_selectedindexchanged, works hoping. guess part don't understand why have put add_ in front of event work in powershell.

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