72 of the aperture 70 therein is in registration with the aperture 68 in the first panel 60 is not present rather in this embodiment structure for accomplishing such a goal is incorporated within the tab dowel ear cam assembly in this embodiment though locking is still effect by movement of the second panel 62 relative to the first panel 60 to dispose the narrowed portion 72 of an aperture 70 in the second panel 62 in registration with the aperture 68 in the first panel 60 fig1 illustrates the manner in which the button blocks 98 function to mount the first and second panels 60 62 relative to one another an inner surface 100 of each button block 98 is in engagement with the bottom 102 of the channel 40 defined within the edge of the slidable door panel 26 an outer surface 104 is in engagement with an inner face 106 of the first panel 60 a fastener such as a screw 108 having a counter sunk head 110 passes through the first panel 60 the button block 98 and into the bottom 102 of the door panel channel 40 a narrowed portion 112 of the button block 98 passes through a corresponding aperture 114 in the second panel 62 free sliding in reciprocal longitudinal movement is thereby enabled fig1 and 14 illustrate the tab dowel ear cam assembly in accordance with the embodiment fig1 illustrates the assembly in an orientation wherein the second panel 62 is in its first position wherein the widened portion 92 of the aperture 70 formed therein is in registration with the aperture 68 in the first panel 60 fig1 illustrates.