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ComboBox.MaxDropDownHeight Property


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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; }

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.

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.

Identifier field


Metadata properties set to true


<object MaxDropDownHeight="double"/>
- or –
<object MaxDropDownHeight ="qualifiedDouble"/>
- or -
<object MaxDropDownHeight ="Auto"/>



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.

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
Available since 3.0
Available since 2.0
Windows Phone Silverlight
Available since 7.0
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