D3DX, rotating object on both z and y axis?

Hey I'm trying to spin my object on both y and z axis.

Like I don't care what axis i am rotating my object, im just trying to rotate 2 axis's at a time.

this is the code that rotates on a z axis.
D3DXMATRIXA16 matWorld;
D3DXMatrixRotationZ( &matWorld, fAngle );
g_pd3dDevice->SetTransform( D3DTS_WORLD, &matWorld );

But how do i get it to rotate on both z and y, i tried the code below but it only rotates on the x axis.
D3DXMATRIXA16 matWorld;
D3DXMatrixRotationZ( &matWorld, fAngle );
D3DXMatrixRotationX( &matWorld, fAngle );
g_pd3dDevice->SetTransform( D3DTS_WORLD, &matWorld );

Whats wrong?

The Rotation function builds a rotation matrix, overriding whatever is in the matrix at the moment. So:

Code:

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D3DXMATRIXA16 matWorld, temp;
D3DXMatrixRotationZ( &matWorld, fAngle );
D3DXMatrixRotationX( &temp, fAngle );
D3DXMatrixMultiply(&matWorld, &matWorld, &temp);
g_pd3dDevice->SetTransform( D3DTS_WORLD, &matWorld );

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