Render glitch in Qt Quick Control ComboBox

On Ubuntu 14.04.1 I have the Qt Quick Control ComboBox that are not rendered properly like seen in attachment.

To reproduce, open the Qt Quick Controls Gallery exemple project. Open a combo box.

My graphic card info:
glxinfo | grep "OpenGL vendor string" -A 10
OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) Ivybridge Mobile
OpenGL core profile version string: 3.3 (Core Profile) Mesa 10.1.3
OpenGL core profile shading language version string: 3.30
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
GL_3DFX_texture_compression_FXT1, GL_AMD_conservative_depth,
GL_AMD_draw_buffers_blend, GL_AMD_performance_monitor,
GL_AMD_seamless_cubemap_per_texture, GL_AMD_shader_trinary_minmax,
GL_AMD_vertex_shader_layer, GL_ANGLE_texture_compression_dxt3,

My window manager:
wmctrl -m
Name: KWin
Class: N/A
PID: N/A
Window manager's "showing the desktop" mode: OFF