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ASPxPopupControlBase.AllowResize Property

Gets or sets a value that specifies whether the control’s window can be resized by end-users on the client side.

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v22.1.dll

NuGet Package: DevExpress.Web


public virtual bool AllowResize { get; set; }

Property Value

Type Default Description
Boolean false

true if window resizing is allowed; otherwise, false.


The AllowResize property controls the availability of the control’s window resizing feature. This feature is coupled with the ASPxPopupControlBase.ResizingMode and ASPxPopupControlBase.ShowSizeGrip property settings.


  • Adaptive mode does not support resizing.
  • You cannot change the ASPxDockPanel size if it is docked. The workaround scenario: undock the panel (the MakeFloat method), dock it back to the dock zone (the Dock(zone) method).
    var zone = pnl1.GetOwnerZone();


At present, ASPxPopupControl does not have the built-in capability to resize nested controls when it's resizing. This example illustrates how to automatically resize controls places inside the popup.

To accomplish this task, execute the following steps:

  1. Set the ScrollBars property to "Auto". This option will allow the popup control to evaluate the content width and height.

  2. Handle the AfterResizing event. In this event handler, call the AdjustControl method for a desired control to force it to reevaluate its size.

  3. Place the control into the <div style="height: 100%; width: 100%; overflow: hidden"> element. This element is necessary to overcome scrollbars that can be shown when ScrollBars="Auto" is set.

View Example

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<head runat="server">
    <title>How to resize ASPxSplitter placed inside ASPxPopupControl when resizing ASPxPopupControl

    <script type="text/javascript">
        function OnClick(s, e) {
        function OnAfterResizing() {

    <form id="form1" runat="server">
        <dx:ASPxPopupControl ID="ASPxPopupControl1" runat="server" Height="500px" Width="500px"
            ScrollBars="Auto" AllowResize="true" LoadContentViaCallback="OnFirstShow">
            <ClientSideEvents AfterResizing="OnAfterResizing" />
                <dx:PopupControlContentControl ID="PopupControlContentControl2" runat="server" SupportsDisabledAttribute="True">
                    <div style="height: 100%; width: 100%; overflow: hidden">
                        <dx:ASPxSplitter ID="ASPxSplitter2" runat="server" Width="100%" Height="100%" ClientInstanceName="splitter">
                                        <dx:SplitterContentControl ID="SplitterContentControl3" runat="server" SupportsDisabledAttribute="True">
                                        <dx:SplitterContentControl ID="SplitterContentControl4" runat="server" SupportsDisabledAttribute="True">
    <dx:ASPxButton ID="ASPxButton1" runat="server" AutoPostBack="False" Text="Show PopUp">
        <ClientSideEvents Click="OnClick" />
See Also