Composite table head and the merger line DataGridView

testDataGridView
................\MultiHeaderDataGridView
................\.......................\bin
................\.......................\...\Debug
................\.......................\HeaderUnitView.cs
................\.......................\HeaderUnitView.designer.cs
................\.......................\HeaderUnitView.resx
................\.......................\MultiHeaderDataGridView.csproj
................\.......................\obj
................\.......................\...\Debug
................\.......................\...\MultiHeaderDataGridView.csproj.FileList.txt
................\.......................\Properties
................\.......................\..........\AssemblyInfo.cs
................\.......................\RowUnitView.cs
................\.......................\RowUnitView.Designer.cs
................\testDataGridView
................\................\bin
................\................\...\Debug
................\................\...\Debug.rar
................\................\Form1.cs
................\................\Form1.Designer.cs
................\................\Form1.resx
................\................\HeaderUnitView.cs
................\................\HeaderUnitView.designer.cs
................\................\HeaderUnitView.resx
................\................\obj
................\................\...\Debug
................\................\...\testDataGridView.csproj.FileList.txt
................\................\Program.cs
................\................\Properties
................\................\..........\AssemblyInfo.cs
................\................\..........\Resources.Designer.cs
................\................\..........\Resources.resx
................\................\..........\Settings.Designer.cs
................\................\..........\Settings.settings
................\................\SailDate.cs
................\................\SailDateComplex.cs
................\................\SailDatePort.cs
................\................\SailerComplex.cs
................\................\SailerVoyageNumber.cs
................\................\testDataGridView.csproj
................\testDataGridView.sln

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