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Do you mean the DCM in a Xilinx FPGA? It has a synthesizer for generating square wave clocks at various frequencies, but it won't be very useful for making sinewaves.
A DDS (Direct Digital Synthesizer) is one easy way to make very good numerical sinewaves. Check your software documentation, you may already have a DDS library component or core. For example, Xilinx ISE 9.1i Core Generator includes "DDS Compiler 2.0" and "Direct Digital Synthesizer 5.0".
after changing it to analog in wave properties am not able to get the sine wave , is it a matter concerned with the version of modelsim ?? this question arises becoz am trying to generate a sine wave for my project