Filtering Related RadGriViews

Thank you for your answer.

I attached a small and simple project to replicate the filtering issue. I couldnt add my Telerik dlls to the zip because the size was bigger than the allowed.
I have these records.

Filtering 1 child applies it to all others.

I also added your solution to set a parent row invisible if it has no childs but it doesnt seem to work.
In this example, I have a parent row with the key "Record3" but there are no childs with that key and the parent row still appears.
Am I doing something wrong? I tried to subscribe the event before populating my grid but by doing that, no rows appear at all.

Thank you.

Thank you for the provided project and additional details. I have overlooked this behavior and I apologize for that. You are right that the filter applied to a child grid will be applied to all children. The reason is that all child views belong to the same template and the filtering operation applies to all views. A possible solution here is to use Custom Filtering behavior. This way you can control which rows should be visible per the filter criteria no matter which child row it is. This approach will require custom implementation on your side. This way you can control the row but still if the user enters filter text in the filter cell, the text will be applied to all child grid filter cells.

Regarding your second question, I have debugged the project and in this case, the DataSource of the grid is set first then the source of the child template. The CreateRow event handler is subscribed to the event after the population and it won't be triggered for the main parent rows. After debugging the best approach here is to use the RowFormatting event instead. You can subscribe to this event before populating the grid. Also, in the FormatGrid() method you can set the MasterTemplate.DataSource last.

Private Sub FrmMain_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    Try
        AddHandler RadGridViewRecords.GridViewElement.RowFormatting, AddressOf GridRowFormatting
        InitData()
        FormatGrid()

    Catch ex As Exception
        RadMessageBox.Show(Me.Text, "Error!", MessageBoxButtons.OK, RadMessageIcon.Error, ex.Message)
    End Try
End Sub

Private Sub GridRowFormatting(sender As Object, e As RowFormattingEventArgs)
    Try
        If TypeOf e.RowElement.RowInfo Is GridViewHierarchyRowInfo Then
            Dim info = e.RowElement.RowInfo
            If info.ChildRows.Count = 0 AndAlso TypeOf info.Parent Is MasterGridViewTemplate Then
                info.IsVisible = False
            End If
        End If
    Catch ex As Exception
        RadMessageBox.Show(Me.Text, "Error!", MessageBoxButtons.OK, RadMessageIcon.Error, ex.Message)
    End Try
End Sub

Private Sub FormatGrid()
    Try
        RadGridViewRecords.Relations.Clear()
        Dim relation As New GridViewRelation(Me.RadGridViewRecords.MasterTemplate)
        relation.RelationName = "Records_Relation"
        relation.ParentColumnNames.Add("ParentColumn1")
        relation.ChildColumnNames.Add("ChildColumn1")
        relation.ChildTemplate = GridViewTemplate1
        Me.RadGridViewRecords.Relations.Add(relation)
        GridViewTemplate1.DataSource = bsChild
        RadGridViewRecords.MasterTemplate.DataSource = bsParent

        RadGridViewRecords.TableElement.TableHeaderHeight = 21
    Catch ex As Exception
        Throw
    End Try
End Sub

I hope my reply is helpful.