回答編集履歴
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追記
test
CHANGED
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タブコントロールのタブをオーナードローすれば、変更できますよ。
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```
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Public Class Form1
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Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
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'タブコントロールの描画モードをオーナードローに変更
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TabControl1.DrawMode = TabDrawMode.OwnerDrawFixed
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End Sub
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Private Sub TabControl1_DrawItem(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DrawItemEventArgs) Handles TabControl1.DrawItem
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Dim backBrush As SolidBrush
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Dim foreBrush As SolidBrush
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Dim font As Font
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'背景や文字色、フォントは自由に設定してください
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If TabControl1.SelectedIndex = e.Index Then
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backBrush = New SolidBrush(Color.Navy)
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foreBrush = New SolidBrush(Color.White)
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font = New Font("Arial Black", 11, FontStyle.Bold)
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Else
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backBrush = New SolidBrush(SystemColors.Control)
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foreBrush = New SolidBrush(Color.Black)
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font = New Font("Arial Black", 11, FontStyle.Regular)
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End If
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Dim format As StringFormat = New StringFormat()
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Dim rect As RectangleF = New RectangleF(e.Bounds.X, e.Bounds.Y + 6, e.Bounds.Width, e.Bounds.Height)
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format.Alignment = StringAlignment.Center
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e.Graphics.FillRectangle(backBrush, e.Bounds)
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e.Graphics.DrawString(TabControl1.TabPages(e.Index).Text, font, foreBrush, rect, format)
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End Sub
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End Class
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```
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