CODEWITHSUNDEEP
c#wpfxaml
Dazzler
Dazzler

Reputation: 382

XAML - LayoutPanel The property 'Content' is set more than once

I am trying to add two ComboBoxes inside a Layout Panel as shown in the code below.

But I am encountering an error - "The property 'Content' is set more than once". How do I add two combo boxes inside a Layout?

            <!--User Control Layout-->
        <dxdo:LayoutGroup x:Name="LayoutGroupTopLevel">
            <dxdo:LayoutGroup x:Name="GridViews" ItemWidth="1*" Orientation="Vertical" AllowClose="True" AllowDock="True" AllowFloat="True" AllowHide="True">

                <dxdo:LayoutPanel x:Name="Layers" Caption="User Control" ItemHeight="1*">
                 <dxdo:LayoutGroup>
                    <dxlc:LayoutItem Label="Plan Type">
                        <dxe:ComboBoxEdit Height="25" VerticalAlignment="Top" Width="200" Name="BoxEdit">
                            <dxe:ComboBoxEditItem Content="3 month"/>
                            <dxe:ComboBoxEditItem Content="2 year"/>
                        </dxe:ComboBoxEdit>
                    </dxlc:LayoutItem>

                    <dxlc:LayoutItem Label="Site">
                        <dxe:ComboBoxEdit Height="25" VerticalAlignment="Top" Width="200" Name="BoxEdit1"/>
                    </dxlc:LayoutItem>
                  </dxdo:LayoutGroup>
                </dxdo:LayoutPanel>

                <dxdo:LayoutPanel x:Name="LayoutPanel" Caption="Properties" ItemHeight="1*">
                    <dxlc:LayoutItem Label="Site">
                        <dxe:ComboBoxEdit Height="25" VerticalAlignment="Stretch" Width="200" Name="ComboBoxEdit"/>
                        <dxe:ComboBoxEdit Height="25" VerticalAlignment="Stretch" Width="200" Name="ComboBoxEdit1"/>
                    </dxlc:LayoutItem>
                </dxdo:LayoutPanel>

       </dxdo:LayoutGroup>

Can anyone please point out the mistake I am committing?

Upvotes: 1

Views: 638

Answers (1)

Grx70
Grx70

Reputation: 10349

Assuming you're using DevExpress WPF controls suite, your error is trying to add two LayoutItems to a LayoutPanel. It only supports either a single UIElement or a LayoutGroup as content (see LayoutPanel documentation, section "Content"). So to complete your goal you should wrap the items with a LayoutGroup:

<dxdo:LayoutPanel x:Name="Layers" (...)>
    <dxdo:LayoutGroup>
        <dxlc:LayoutItem Label="Plan Type">(...)</dxlc:LayoutItem>
        <dxlc:LayoutItem Label="Site">(...)</dxlc:LayoutItem>
    </dxdo:LayoutGroup>
</dxdo:LayoutPanel>

UPDATE

As you pointed out (and it slipped my attention) you cannot directly add a dxlc:LayoutItem into a dxdo:LayoutGroup; you should wrap it in a dxdo:LayoutControlItem (again, it's all in the documentation):

<dxdo:LayoutPanel x:Name="Layers" (...)>
    <dxdo:LayoutGroup>
        <dxdo:LayoutControlItem>
            <dxlc:LayoutItem Label="Plan Type">(...)</dxlc:LayoutItem>
        </dxdo:LayoutControlItem>
        <dxdo:LayoutControlItem>
            <dxlc:LayoutItem Label="Site">(...)</dxlc:LayoutItem>
        </dxdo:LayoutControlItem>
    </dxdo:LayoutGroup>
</dxdo:LayoutPanel>

Alternatively, you can drop dxlc:LayoutItem altogether and use only dxdo:LayoutControlItem (use Caption property instead of Label):

<dxdo:LayoutPanel x:Name="Layers" (...)>
    <dxdo:LayoutGroup>
        <dxdo:LayoutControlItem Caption="Plan Type">(...)</dxdo:LayoutControlItem>
        <dxdo:LayoutControlItem Caption="Site">(...)</dxdo:LayoutControlItem>
    </dxdo:LayoutGroup>
</dxdo:LayoutPanel>

CLARIFICATION

To disambiguate:

  • xmlns:dxdo="http://schemas.devexpress.com/winfx/2008/xaml/docking"
  • xmlns:dxlc="http://schemas.devexpress.com/winfx/2008/xaml/layoutcontrol"

Upvotes: 2

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