According to this thread ([DEAD LINK] http://vcampus.osisoft.com/discussion_hall/add_in_microsoft_development/f/11/p/1608/8057.aspx) it seems that the ContextHandler event is early in the context changing process.
I have 3 values which get their values based on the context, and whenever the context handler event kicks in I want to update the traces on a trend. Now the problem seems to be that these value-symbols haven't been updated with their new context-sensitive information, OR that I can't see any changes in the trend after inserting/updating the traces.
Any tips 'n tricks for doing what I want?
It all seems to work if I input a breakpoint or just show a message box with some random stuff early in my UpdateTrend-method.
Private WithEvents myCtxtHndlr As ContextHandler Private Sub Display_Open() Set myCtxtHndlr = Application.ContextHandlers("E") End Sub Private Sub myCtxtHndlr_ContextChanged(FromDisplay As Display, FromContextHandler As ContextHandler) UpdateTrend thisTrend:=Trend1 End Sub Private Sub UpdateTrend(ByRef thisTrend As Trend) Dim vIndex As Integer Dim status As Boolean Dim restatus As Variant Dim trafo1 As String Dim trace1 As String 'Remove all trend traces For vIndex = thisTrend.TraceCount To 1 Step -1 status = thisTrend.RemoveTrace(vIndex) Next vIndex 'Check and set trace trafo1 = value_transformer1.GetValue(Now, restatus) If (trafo1 <> "n" And trafo1 <> "") Then trace1 = "E.\Equipment repository\Transformers\" & trafo1 & "|HV Active power" status = thisTrend.AddTrace(trace1) End If End Sub