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ComboBox.MaxDropDownHeight Property

Gets or sets the maximum height for a combo box drop-down.

Namespace:  System.Windows.Controls
Assembly:  PresentationFramework (in PresentationFramework.dll)

public double MaxDropDownHeight { get; set; }
<object MaxDropDownHeight="double"/>
- or –
<object MaxDropDownHeight ="qualifiedDouble"/>
- or -
<object MaxDropDownHeight ="Auto"/>

XAML Values



String representation of a Double value. This is interpreted as a device-independent unit (1/96th inch) measurement. Strings need not explicitly include decimal points. For instance a value of 1 is acceptable.

The same Double range restrictions as mentioned in the Property Value section apply.


A double value as described above, followed by one of the following unit declaration strings: px, in, cm, pt.

px (default) is device-independent units (1/96th inch per unit)

in is inches; 1in==96px

cm is centimeters; 1cm==(96/2.54) px

pt is points; 1pt==(96/72) px


Enables autosizing behavior. See Remarks.

Property Value

Type: System.Double
A double that represents the height that is retrieved or the height to set. The default value as defined to the property system is a calculated value based on taking a one-third fraction of the system max screen height parameters, but this default is potentially overridden by various control templates.

Identifier field


Metadata properties set to true


Auto sizing is not the default, and will result in the drop down size potentially exceeding the available size in the parent element. This is not typically desirable.

The following example shows how to use the MaxDropDownHeight property to specify the height of the ComboBox control's drop-down.

<Setter Property = "MaxDropDownHeight" Value="30"/>

.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.