Incorrectly self-resizing RadMenuItem

[Taylor]

I'm using 2009 Q3 Winforms.  In order to create a multi-select dropdown combobox, I used a few other forum posts' responses as a guide.  I created a GridMenuItem class that inherited from RadMenuItemBase and implemented INotifyPropertyChanged.  That GridMenuItem contains a RadGridView and adds that GridView as a RadHostItem to its children. 

Anyway, what happens is that the dropdown grid will resize itself each time you drop it down.  It appears to be decreasing the height while increasing the width, by a small amount (I think around 6 both ways).  Eventually you get to an ever-increasing line.  I cannot seem to figure out what is wrong.

Below is the code to show what is happening.

Thoughts?

(Create a new Forms project with Form1, add a dropdown button)

 

Imports Telerik.WinControls
Imports Telerik.WinControls.UI
Imports System.Text
Imports System.Data.Common
Imports System.ComponentModel

Public Class Form1

    Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim Item As GridMenuItem = New GridMenuItem
        Dim Grid As RadGridView = Item.Grid

        Grid.Columns.Add(New GridViewDataColumn("A"))
        Grid.Columns.Add(New GridViewDataColumn("b"))
        Grid.Columns.Add(New GridViewDataColumn("c"))
        Grid.Rows.Add("Hello", "World", "!")
        Grid.Rows.Add("Hello", "World", "!")
        Grid.Rows.Add("Hello", "World", "!")
        Grid.ReadOnly = False
        Grid.Columns(0).Width = 5
        Grid.Columns(1).ReadOnly = True
        Grid.Columns(2).IsVisible = False
        RadDropDownButton1.Items.Clear()
        RadDropDownButton1.Items.Add(Item)
    End Sub
End Class

Here's the item:

Imports Telerik.WinControls.UI
Imports Telerik.WinControls
Imports System.ComponentModel

Public Class GridMenuItem
    Inherits RadMenuItemBase
    Implements INotifyPropertyChanged

    Dim _Grid As RadGridView
    Dim _HostItem As RadHostItem

    Public ReadOnly Property Grid() As RadGridView
        Get
            Return Me._Grid
        End Get
    End Property

    Protected Overrides Sub CreateChildElements()
        _Grid = New RadGridView()
        _Grid.BeginInit()
        _Grid.BindingContext = New BindingContext()

        _Grid.MultiSelect = True
        _Grid.AutoSize = False
        _Grid.HideColumnChooser()
        _Grid.ReadOnly = False
        _Grid.ShowGroupPanel = False
        _Grid.ShowNoDataText = False
        Dim Template As GridViewTemplate = _Grid.MasterGridViewTemplate
        Template.AllowCellContextMenu = False
        Template.AllowColumnChooser = False
        Template.AllowColumnHeaderContextMenu = False
        Template.AllowColumnReorder = False
        Template.AllowAddNewRow = False
        Template.AutoSizeColumnsMode = Telerik.WinControls.UI.GridViewAutoSizeColumnsMode.Fill
        Template.EnableGrouping = False
        Template.ShowFilteringRow = False
        Template.ShowRowHeaderColumn = False
        Template.ShowColumnHeaders = False

        _Grid.EndInit()
        _HostItem = New RadHostItem(_Grid)
        Me.Children.Add(_HostItem)
    End Sub

    Protected Overrides Function MeasureOverride(ByVal availableSize As System.Drawing.SizeF) As System.Drawing.SizeF
        Dim size As System.Drawing.SizeF = MyBase.MeasureOverride(availableSize)
        Return _Grid.Size
    End Function
End Class

[Nikolay]

Hi Brandon Beam,

The encountered behavior occurs because of the control hosting specifics. In order to set a custom size to the GridMenuItem, please give a constant size value:

Protected Overrides Function MeasureOverride(ByVal availableSize As System.Drawing.SizeF) As System.Drawing.SizeF
     Return New Size(250, 150)
End Function

I hope this helps. If you have additional questions, feel free to contact me.

Regards,
Nikolay
the Telerik team

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[Taylor]

I used this idea to create a property that I read in the MeasureOverride method, and that seems to work (though it is more kludgy than letting the underlying grid know how to resize itself).

[Nikolay]

Hello Brandon Beam,

We are glad that this approach helps. You can write back if you need further assistance.

All the best,
Nikolay
the Telerik team

Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking system and vote to affect the priority of the items.