# C1.Win.Schedule.BeforeGroupHeaderFormatEventArgs.TriangleTab

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<h1 id="C1_Win_Schedule_BeforeGroupHeaderFormatEventArgs_TriangleTab_" data-uid="C1.Win.Schedule.BeforeGroupHeaderFormatEventArgs.TriangleTab*">TriangleTab Property
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<a id="C1_Win_Schedule_BeforeGroupHeaderFormatEventArgs_TriangleTab_" data-uid="C1.Win.Schedule.BeforeGroupHeaderFormatEventArgs.TriangleTab*"></a>
<h4 id="C1_Win_Schedule_BeforeGroupHeaderFormatEventArgs_TriangleTab" data-uid="C1.Win.Schedule.BeforeGroupHeaderFormatEventArgs.TriangleTab">TriangleTab</h4>
<div class="markdown level1 summary"><p>Gets or sets the <a class="xref" href="https://learn.microsoft.com/dotnet/api/system.boolean">bool</a> value determining the group header tab appearance.
If this property value is true, C1Schedule will show MS Outlook 2010-alike group headers.
If this property value is false, C1Schedule will display rectangular group headers.</p>
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<h5 class="declaration">Declaration</h5>
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  <pre><code class="lang-csharp hljs">[Obsolete(&quot;This property is obsolete, use GroupTabStyle property instead.&quot;)]
public bool TriangleTab { get; set; }</code></pre>
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  <pre><code class="lang-vbnet hljs">&lt;Obsolete(&quot;This property is obsolete, use GroupTabStyle property instead.&quot;)&gt;
Public Property TriangleTab As Boolean</code></pre>
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