回答編集履歴
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追記
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@@ -3,3 +3,63 @@
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[ComboBoxの項目を自分で描画する - .NET Tips (VB.NET,C#...)](https://dobon.net/vb/dotnet/control/cbownerdraw.html)
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# 追記
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ComboBox をフォームに貼り付けて comboBox1 とし、Mode を OwnerDrawFixed に変更。DrawItem イベントを作成して次のように実装して実行したところ、頭合わせできました。
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```C#
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using System.Drawing;
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using System.Windows.Forms;
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namespace WindowsFormsApp1
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{
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public partial class Form1 : Form
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{
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public Form1()
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{
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InitializeComponent();
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comboBox1.Items.AddRange(new[] { "abcdef\tghi", "Hello\tWorld" });
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}
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private void ComboBox1_DrawItem(object sender, DrawItemEventArgs e)
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{
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e.Graphics.DrawString(
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comboBox1.Items[e.Index]?.ToString(),
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comboBox1.Font,
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new SolidBrush(comboBox1.ForeColor),
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e.Bounds.Location);
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}
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}
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}
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```
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