how can i reach the design objects from the vs code page

i made the report the class.
i want to change the some properties from code behind. i m using the matrix
and i iwant to put column(with relation table.field) on matrix object and some different changes
but i havent successed
        Meslek mes = new Meslek();
        mes.RegisterDataAsp(SqlDataSource1, "SqlDataSource1");
        //mes.GetDataSource("SqlDataSource1").Columns[0].Delete();
        //mes.Matrix1.Columns[0].Dispose();
        WebReport1.Report = mes;
my english is not good
i hope you understand me

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