MVVM - WPF DataGrid - AutoGeneratingColumn Event -

i'm taking @ excellent toolkit laurent , have following question.

from blend 4, have added eventtrigger loaded event, in viewmodel have following:

public relaycommand rcautogeneratingcolumn { get; private set; } 

in constructor have:

rcautogeneratingcolumn =     new relaycommand(o => datagridautogeneratingcolumn(o)); 

also in viewmodel, have method wish invoked relaycommand:

    private void datagridautogeneratingcolumn(object o)     {         datagrid grid = (datagrid)o;          foreach (datagridtextcolumn col in grid.columns)         {             if (col.header.tostring().tolower() == "id")             {                 col.visibility = system.windows.visibility.hidden;             }         }     } 

my xaml contains following (for datagrid):

<i:interaction.triggers>     <i:eventtrigger eventname="loaded">         <galasoft_mvvmlight_command:eventtocommand              command="{binding rcautogeneratingcolumn, mode=oneway}"             commandparameter="{binding elementname=datagrid1, mode=oneway}"/>     </i:eventtrigger> </i:interaction.triggers> 

there no problem here code works fine, event used hide columns should autogeneratingcolumn event , not loaded. have used loaded event getaround.

i hoping relay event offered control that, in case, following work instead:

<i:interaction.triggers>     <i:eventtrigger eventname="autogeneratingcolumn">         <galasoft_mvvmlight_command:eventtocommand              command="{binding rcautogeneratingcolumn, mode=oneway}"             commandparameter="{binding elementname=datagrid1, mode=oneway}"/>     </i:eventtrigger> </i:interaction.triggers> 

i unable autogeneratingcolumn event trigger, , i'm hoping i've overlooked , appreciate advice given!

this behaviour same gridcontrol devexpress, in loaded event triggered whereas columnspopulated event (this being equivalent of autogeneratingcolumn event) not.

devexpress offered following information regard question:

"we have reviewed question, , come interesting conclusion. looks visual tree not being built @ moment when interaction.triggers being processed"

if true, , there no other way in invoke events within viewmodel, 1 have go ahead , - using trial , error - note of datagrid events (of there on 100) can invoked in way , cannot!

one think every event available in code-behind, can reached when applying mvvm pattern.

i have searched answer cannot rule out have overlooked something, if case, please accept apologies!

during course of developing project mvvm you're going have circumstances must handle events in view's code-behind , eventtocommand plain doesn't work. find silverlight, assume question you're using wpf. it's okay event handling in view's code-behind, don't put business logic there. can leave command in view model, call directly event handler.

((yourviewmodel)this.datacontext).rcautogeneratingcolumn.execute(sender);