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1.Column display date control
The grid automatically creates an editor with a drop-down calendar if the field (Column.FieldName) is of type TDateTimeField or TDateField.
You cannot insert external controls into the grid cell.
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2.database insert into value=null
Grid only insert values to DataSet.
DataSet must provide data transfer to the DataBase.
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3.display picture
Set DBGridEh.DrawGraphicData = True and
The Field should be a TBlobField type and Field.BlobType = ftGraphic
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4.Date legal query
Sorry, but I do not understand this question.
What is legal query